Year	Cases per 100,000
1990	24.4
1991	37.1
1992	54.8
1993	77.9
1994	105.4
1995	136
1996	169
1997	206.6
1998	253.6
1999	315.7
2000	393.7
2001	478.5
2002	555.1
2003	612.6
2004	650.2
2005	672.5
2006	684.7
2007	690.9